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                        <h1 class="file-heading">File: src&#x2F;pixi&#x2F;DisplayObjectContainer.js</h1>

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    <pre class="code prettyprint linenums">
&#x2F;**
 * @author Mat Groves http:&#x2F;&#x2F;matgroves.com&#x2F; @Doormat23
 *&#x2F;


&#x2F;**
 * A DisplayObjectContainer represents a collection of display objects. It is the base class of all display objects that act as a container for other objects.
 * @class DisplayObjectContainer 
 * @extends DisplayObject
 * @constructor
 *&#x2F;
PIXI.DisplayObjectContainer = function()
{
	PIXI.DisplayObject.call( this );
	
	&#x2F;**
	 * [read-only] The of children of this container.
	 * @property children {Array}
	 *&#x2F;	
	this.children = [];
	&#x2F;&#x2F;s
	this.renderable = false;
}

&#x2F;&#x2F; constructor
PIXI.DisplayObjectContainer.constructor = PIXI.DisplayObjectContainer;
PIXI.DisplayObjectContainer.prototype = Object.create( PIXI.DisplayObject.prototype );

&#x2F;**
 * Adds a child to the container.
 * @method addChild
 * @param  DisplayObject {DisplayObject}
 *&#x2F;
PIXI.DisplayObjectContainer.prototype.addChild = function(child)
{
	if(child.parent != undefined)
	{
		child.parent.removeChild(child)
	}
	
	child.parent = this;
	child.childIndex = this.children.length;
	
	this.children.push(child);	
	if(this.stage)
	{
		this.stage.__addChild(child);
	}
}

&#x2F;**
 * Adds a child to the container at a specified index. If the index is out of bounds an error will be thrown
 * @method addChildAt
 * @param DisplayObject {DisplayObject}
 * @param index {Number}
 *&#x2F;
PIXI.DisplayObjectContainer.prototype.addChildAt = function(child, index)
{
	if(index &gt;= 0 &amp;&amp; index &lt;= this.children.length)
	{
		if(child.parent != undefined)
		{
			child.parent.removeChild(child);
		}
	
		if (index == this.children.length)
		{
		  	this.children.push(child);
		}	
		else 
		{
			this.children.splice(index, 0, child);
		}

		child.parent = this;
		child.childIndex = index;
		
		var length = this.children.length;
		for (var i=index; i &lt; length; i++) 
		{
		  this.children[i].childIndex = i;
		}
		
		if(this.stage)
		{
			this.stage.__addChild(child);
		}
	}
	else
	{
		&#x2F;&#x2F; error!
		
		throw new Error(child + &quot; The index &quot;+ index +&quot; supplied is out of bounds &quot; + this.children.length);
	}
}

&#x2F;**
 * Swaps the depth of 2 displayObjects
 * @method swapChildren
 * @param  DisplayObject {DisplayObject}
 * @param  DisplayObject2 {DisplayObject}
 *&#x2F;
PIXI.DisplayObjectContainer.prototype.swapChildren = function(child, child2)
{
	&#x2F;&#x2F; TODO I already know this??
	var index = this.children.indexOf( child );
	var index2 = this.children.indexOf( child2 );
	
	if ( index !== -1 &amp;&amp; index2 !== -1 ) 
	{
		&#x2F;&#x2F; cool
		if(this.stage)
		{
			&#x2F;&#x2F; this is to satisfy the webGL batching..
			&#x2F;&#x2F; TODO sure there is a nicer way to achieve this!
			this.stage.__removeChild(child);
			this.stage.__removeChild(child2);
			
			this.stage.__addChild(child);
			this.stage.__addChild(child2);
		}
		
		&#x2F;&#x2F; swap the indexes..
		child.childIndex = index2;
		child2.childIndex = index;
		&#x2F;&#x2F; swap the positions..
		this.children[index] = child2;
		this.children[index2] = child;
		
	}
	else
	{
		throw new Error(child + &quot; Both the supplied DisplayObjects must be a child of the caller &quot; + this);
	}
}

&#x2F;**
 * Returns the Child at the specified index
 * @method getChildAt
 * @param  index {Number}
 *&#x2F;
PIXI.DisplayObjectContainer.prototype.getChildAt = function(index)
{
	if(index &gt;= 0 &amp;&amp; index &lt; this.children.length)
	{
		return this.children[index];
	}
	else
	{
		throw new Error(child + &quot; Both the supplied DisplayObjects must be a child of the caller &quot; + this);
	
	}
}

&#x2F;**
 * Removes a child from the container.
 * @method removeChild
 * @param  DisplayObject {DisplayObject}
 *&#x2F;
PIXI.DisplayObjectContainer.prototype.removeChild = function(child)
{
	var index = this.children.indexOf( child );

	if ( index !== -1 ) 
	{
		if(this.stage)this.stage.__removeChild(child);
		child.parent = undefined;
		&#x2F;&#x2F;child.childIndex = 0
		this.children.splice( index, 1 );
	
		&#x2F;&#x2F; update in dexs!
		for(var i=index,j=this.children.length; i&lt;j; i++)
		{
			this.children[i].childIndex -= 1;
		}
	}
	else
	{
		throw new Error(child + &quot; The supplied DisplayObject must be a child of the caller &quot; + this);
	}
}


&#x2F;**
 * @private
 *&#x2F;
PIXI.DisplayObjectContainer.prototype.updateTransform = function()
{
	if(!this.visible)return;
	
	PIXI.DisplayObject.prototype.updateTransform.call( this );
	
	for(var i=0,j=this.children.length; i&lt;j; i++)
	{
		this.children[i].updateTransform();	
	}
}

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